Yarn string-up roll



Nov. 19, 1968 v F. H. ENGLEMAN ET AL 3,411,726

YARN STRING-UP ROLL Filed Dec. 12} 1966 FIG.I. v F1 2,.

7 INVENTORS F. H. ENGELMAN D. E-. FISHER AGENT United States Patent 3,411,726 YARN STRING-UP ROLL Frederick H. Engleman, Cary, N.C., and Don E. Fisher, Pensacola, Fla., assignors to Monsanto Company, St. Louis, Mo., a corporation of Delaware Filed Dec. 12, 1966, Ser. No. 600,970 2 Claims. (Cl. 24218) ABSTRACT OF THE DISCLOSURE A yarn string-up roll having a peripherally open, internal slot extending backwardly from the direction of rotation of said roll between spaced, opposed walls one depending over the other, and a ball displaceable by centrifugal force into said slot for holding a yarn between the ball and slot wall surfaces.

Background of the invention In the art of winding continuous yarns onto bobbins it is common to lace or string-up a yarn, as with an aspirator gun, through a number of guide elements of a winding machine and to use some final anchoring means to attach the end of the yarn to before the yarn is traversed across a bobbin. conventionally, a yarn end is anchored by wedging the end within a tapered slot formed in a rotating spool positioned next to a bobbin and then breaking it away from the slot. After a bobbin is packaged with yarn, the yarn end extending from the tapered slot to the bobbin is cut leaving a trapping or portion in the tapered slot. This presents a problem. Yarn trappings become tightly wedged in the slot and are ditficult to remove. If a number of trappings are left in the slot, the effective wedging action of the slot is reduced and the yarn length extending from the slot to the bobbin flutters unrestrainedly during a yarn winding process.

Summary 0 the invention The novel yarn string-up roll comprises a rotary means having a slot and a raceway that is open at one end to the slot and closed at its opposite end. A centrifugally displaceable member, such as a small ball, is positioned within the raceway and is displaced into the slot when the rotary means is driven.

A yarn end is snagged or anchored by introducing the end into the slot and trapping the end between the ball and a wall defining the slot while the rotary means is being driven. The grip or hold applied to the yarn by the ball is released when the rotatable means is brought to a stop. As compared with the use of a tapered slot of the old art for snagging yarn, the present invention overcomes the problem of removal of yarn pieces or trappings from the slot.

Brief description of the drawing A better understanding of the invention will be gained by referring to the more detailed description that follows and to the accompanying drawing.

In the drawing:

FIGURE 1 is a side elevation view of the novel yarn snag device,

FIGURE 2 is a front elevation view partly in section of the yarn snag device, and

FIGURE 3 is an elevation view showing the yarn snag Patented Nov. 19, 1968 "ice Description of a preferred embodiment Referring to the drawing (FIGS. 1-3) the novel yarn string-up roll 1 comprises a rotary member 2, as a ring or roll, adapted to be mounted on a driven shaft. Roll 2 has an inwardly extending slot 3 defined by spaced, opposed slot walls 4 and 5, respectively. Wall 4 projects in spaced, depending relation over wall 5 so that slot 3 extends internally of roll 2 from a front end thereof for a distance backwardly of roll 2 relative to the direction of rotation thereof. Slot 3 is open peripherally therearound and is closed at its back end by a wall connecting walls 4 and 5. The edges leading to slot 3 are preferably smooth to allow a yarn to slide readily into slot 3. A raceway 6 opens at one end thereof into slot 3 through wall 5 defining slot 3 and is closed at its opposite end.

In the illustration, raceway 6 is drilled from the inside of roll 2 to a point where it intersects with slot 3 and the inner end is then plugged. Prior to closing ofi raceway 6 at one end, as with a plug 7, a displaceable mass or member, such as a ball 8, is placed in the raceway 6 and is thus caged or trapped therein.

In application, roll 2 is shown positioned adjacent a bobbin 9 that is surface driven by a drive roll 10. A traverse device 11 is shown above roll 10. When bobbin 9 and snag device 1 are driven, ball 8 is displaced forceably by centrifugal force against and into abutment or contact with wall 4 defining slot 3. In a customary manner, an operator using an aspirator gun laces a continuous yarn through the guide elements of a winding machine and then brings the yarn into the path of rotating roll 2 and introduces the yarn into slot 3. The yarn is moved to a point where it is lodged or snagged between ball 8 and slot wall 4. With the yarn snagged under ball 8, the operator maneuvers the aspirator gun to effect a break in the yarn as shown in FIG. 3. The yarn end is trapped under ball 8 while a yarn package is being built. Upon completion of the packaging process, bobbin 9 and roll 2 are brought to a stop. When roll 2 is stopped, ball 8 unleashed of centrifugal force, loosens its grip on the yarn and the latter either falls away from slot 3 or is readily removed therefrom depending on the position in which the roll 2 comes to a rest. No trappings or pie es of yarn accumulate in slot 3 as occurs with the use of a conventional tapered slot.

It will be understood that variations and modifications from the illustrated embodiment of the yarn string-up roll are expected to be covered within the purview of the invention and within the scope of the following claims.

We claim:

1. A yarn string-up device comprising,

a roll adapted to be driven and having an internal wall projecting in spaced, depending relation over an opposed wall to define a slot therebetween extending, openly, from a frontal end backwardly of said roll relative to the direction of rotation therof to a closed end defined by the joining of said walls, said slot being adapted to receive a yarn brought within the rotating path of said frontal end thereof,

a raceway defined in said roll closed at one end and open at its opposite end to said opposed wall defining said slot, and

centrifugally displaceable means in said raceway.

2. A yarn string-up device as in claim 1, wherein said centrifugally displaceable means comprises a ball that is 3 4 forced by centrifugal force into said slot and against 3,009,662 11/1961 Furst 24227 said internal wall when said roll is driven. 3,162,388 12/1964 Balash.

3,319,900 5/1967 Abbott 242-43.2

UNITE S S T Z FIZS I Z TENTS FOREI P TE TS 974,536 4/ 1961 Germany. 2,262,145 11/1941 Kimpton.

2,304,712 12/ 1942 Siegenthaler 24227 STANLEY N. GILREATH, Primary Examiner. 2,998,202 8/1961 Keith et a1 242-18 

